Cadwaladerite | |
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![]() Yellow microcrystals and masses of the very rare aluminium chloride-hydroxide mineral Cadwaladerite from only one the three known localities worldwide: Maria Mine, Caleta Vítor District, Arica & Parinacota Region, Chile. | |
General | |
Category | Halide mineral |
Formula (repeating unit) | AlCl(OH)2·4(H2O) |
IMA symbol | Cwd [1] |
Strunz classification | 3.BD.05 |
Crystal system | amorphous |
Identification | |
Formula mass | 168.51 g/mol |
Color | Lemon yellow |
Fracture | Conchoidal |
Luster | Vitreous |
Diaphaneity | transparent |
Specific gravity | 1.66 |
Optical properties | Isotropic |
Refractive index | n = 1.513, variable |
Other characteristics | deliquescent |
References | [2] [3] [4] [5] |
Cadwaladerite is a rare aluminium halide mineral with formula: AlCl(OH)2·4(H2O). It was reported for an amorphous substance associated with sulfate minerals and embedded in a halite crystal cluster. Its status is uncertain due to inadequate data. [3] [4] [5] It was first described in 1941 for an occurrence in mine dumps of the Victoria Segunda mine Cerros Pintados, Iquique province, Tarapacá Region, Chile. [4] It was named for Charles Meigs Biddle Cadwalader, president of the Academy of Natural Sciences. [5] Lesukite was discredited (IMA2018-H).
Cadwaladerite | |
---|---|
![]() Yellow microcrystals and masses of the very rare aluminium chloride-hydroxide mineral Cadwaladerite from only one the three known localities worldwide: Maria Mine, Caleta Vítor District, Arica & Parinacota Region, Chile. | |
General | |
Category | Halide mineral |
Formula (repeating unit) | AlCl(OH)2·4(H2O) |
IMA symbol | Cwd [1] |
Strunz classification | 3.BD.05 |
Crystal system | amorphous |
Identification | |
Formula mass | 168.51 g/mol |
Color | Lemon yellow |
Fracture | Conchoidal |
Luster | Vitreous |
Diaphaneity | transparent |
Specific gravity | 1.66 |
Optical properties | Isotropic |
Refractive index | n = 1.513, variable |
Other characteristics | deliquescent |
References | [2] [3] [4] [5] |
Cadwaladerite is a rare aluminium halide mineral with formula: AlCl(OH)2·4(H2O). It was reported for an amorphous substance associated with sulfate minerals and embedded in a halite crystal cluster. Its status is uncertain due to inadequate data. [3] [4] [5] It was first described in 1941 for an occurrence in mine dumps of the Victoria Segunda mine Cerros Pintados, Iquique province, Tarapacá Region, Chile. [4] It was named for Charles Meigs Biddle Cadwalader, president of the Academy of Natural Sciences. [5] Lesukite was discredited (IMA2018-H).